2 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
26 #include "gstrtpgsmenc.h"
28 /* elementfactory information */
29 static GstElementDetails gst_rtpgsmenc_details = {
30 "RTP GSM Audio Encoder",
31 "Codec/Encoder/Network",
32 "Encodes GSM audio into a RTP packet",
33 "Zeeshan Ali <zak147@yahoo.com>"
36 /* RtpGSMEnc signals and args */
49 static GstStaticPadTemplate gst_rtpgsmenc_sink_template =
50 GST_STATIC_PAD_TEMPLATE ("sink",
53 GST_STATIC_CAPS ("audio/x-gsm, " "rate = (int) [ 1000, 48000 ]")
56 static GstStaticPadTemplate gst_rtpgsmenc_src_template =
57 GST_STATIC_PAD_TEMPLATE ("src",
60 GST_STATIC_CAPS ("application/x-rtp")
64 static void gst_rtpgsmenc_class_init (GstRtpGSMEncClass * klass);
65 static void gst_rtpgsmenc_base_init (GstRtpGSMEncClass * klass);
66 static void gst_rtpgsmenc_init (GstRtpGSMEnc * rtpgsmenc);
67 static void gst_rtpgsmenc_chain (GstPad * pad, GstData * _data);
68 static void gst_rtpgsmenc_set_property (GObject * object, guint prop_id,
69 const GValue * value, GParamSpec * pspec);
70 static void gst_rtpgsmenc_get_property (GObject * object, guint prop_id,
71 GValue * value, GParamSpec * pspec);
72 static GstPadLinkReturn gst_rtpgsmenc_sinkconnect (GstPad * pad,
73 const GstCaps * caps);
74 static GstElementStateReturn gst_rtpgsmenc_change_state (GstElement * element);
76 static GstElementClass *parent_class = NULL;
79 gst_rtpgsmenc_get_type (void)
81 static GType rtpgsmenc_type = 0;
83 if (!rtpgsmenc_type) {
84 static const GTypeInfo rtpgsmenc_info = {
85 sizeof (GstRtpGSMEncClass),
86 (GBaseInitFunc) gst_rtpgsmenc_base_init,
88 (GClassInitFunc) gst_rtpgsmenc_class_init,
91 sizeof (GstRtpGSMEnc),
93 (GInstanceInitFunc) gst_rtpgsmenc_init,
97 g_type_register_static (GST_TYPE_ELEMENT, "GstRtpGSMEnc",
100 return rtpgsmenc_type;
104 gst_rtpgsmenc_base_init (GstRtpGSMEncClass * klass)
106 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
108 gst_element_class_add_pad_template (element_class,
109 gst_static_pad_template_get (&gst_rtpgsmenc_sink_template));
110 gst_element_class_add_pad_template (element_class,
111 gst_static_pad_template_get (&gst_rtpgsmenc_src_template));
112 gst_element_class_set_details (element_class, &gst_rtpgsmenc_details);
116 gst_rtpgsmenc_class_init (GstRtpGSMEncClass * klass)
118 GObjectClass *gobject_class;
119 GstElementClass *gstelement_class;
121 gobject_class = (GObjectClass *) klass;
122 gstelement_class = (GstElementClass *) klass;
124 parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
126 gobject_class->set_property = gst_rtpgsmenc_set_property;
127 gobject_class->get_property = gst_rtpgsmenc_get_property;
129 gstelement_class->change_state = gst_rtpgsmenc_change_state;
133 gst_rtpgsmenc_init (GstRtpGSMEnc * rtpgsmenc)
136 gst_pad_new_from_template (gst_static_pad_template_get
137 (&gst_rtpgsmenc_sink_template), "sink");
139 gst_pad_new_from_template (gst_static_pad_template_get
140 (&gst_rtpgsmenc_sink_template), "src");
141 gst_element_add_pad (GST_ELEMENT (rtpgsmenc), rtpgsmenc->sinkpad);
142 gst_element_add_pad (GST_ELEMENT (rtpgsmenc), rtpgsmenc->srcpad);
143 gst_pad_set_chain_function (rtpgsmenc->sinkpad, gst_rtpgsmenc_chain);
144 gst_pad_set_link_function (rtpgsmenc->sinkpad, gst_rtpgsmenc_sinkconnect);
146 rtpgsmenc->frequency = 8000;
148 rtpgsmenc->next_time = 0;
149 rtpgsmenc->time_interval = 0;
152 rtpgsmenc->ssrc = random ();
155 static GstPadLinkReturn
156 gst_rtpgsmenc_sinkconnect (GstPad * pad, const GstCaps * caps)
158 GstRtpGSMEnc *rtpgsmenc;
159 GstStructure *structure;
162 rtpgsmenc = GST_RTP_GSM_ENC (gst_pad_get_parent (pad));
164 structure = gst_caps_get_structure (caps, 0);
166 ret = gst_structure_get_int (structure, "rate", &rtpgsmenc->frequency);
168 return GST_PAD_LINK_REFUSED;
170 /* Pre-calculate what we can */
171 rtpgsmenc->time_interval = GST_SECOND / (2 * rtpgsmenc->frequency);
173 return GST_PAD_LINK_OK;
178 gst_rtpgsmenc_htons (GstBuffer * buf)
182 /* FIXME: is this code correct or even sane at all? */
183 i = (gint16 *) GST_BUFFER_DATA (buf);
184 len = i + GST_BUFFER_SIZE (buf) / sizeof (gint16 *);
186 for (; i < len; i++) {
192 gst_rtpgsmenc_chain (GstPad * pad, GstData * _data)
194 GstBuffer *buf = GST_BUFFER (_data);
195 GstRtpGSMEnc *rtpgsmenc;
199 g_return_if_fail (pad != NULL);
200 g_return_if_fail (GST_IS_PAD (pad));
201 g_return_if_fail (buf != NULL);
203 rtpgsmenc = GST_RTP_GSM_ENC (GST_OBJECT_PARENT (pad));
205 g_return_if_fail (rtpgsmenc != NULL);
206 g_return_if_fail (GST_IS_RTP_GSM_ENC (rtpgsmenc));
208 if (GST_IS_EVENT (buf)) {
209 GstEvent *event = GST_EVENT (buf);
211 switch (GST_EVENT_TYPE (event)) {
212 case GST_EVENT_DISCONTINUOUS:
213 GST_DEBUG ("discont");
214 rtpgsmenc->next_time = 0;
215 gst_pad_event_default (pad, event);
218 gst_pad_event_default (pad, event);
223 /* We only need the header */
224 packet = rtp_packet_new_allocate (0, 0, 0);
226 rtp_packet_set_csrc_count (packet, 0);
227 rtp_packet_set_extension (packet, 0);
228 rtp_packet_set_padding (packet, 0);
229 rtp_packet_set_version (packet, RTP_VERSION);
230 rtp_packet_set_marker (packet, 0);
231 rtp_packet_set_ssrc (packet, g_htonl (rtpgsmenc->ssrc));
232 rtp_packet_set_seq (packet, g_htons (rtpgsmenc->seq));
233 rtp_packet_set_timestamp (packet,
234 g_htonl ((guint32) rtpgsmenc->next_time / GST_SECOND));
235 rtp_packet_set_payload_type (packet, (guint8) PAYLOAD_GSM);
237 /* FIXME: According to RFC 1890, this is required, right? */
238 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
239 gst_rtpgsmenc_htons (buf);
242 outbuf = gst_buffer_new ();
243 GST_BUFFER_SIZE (outbuf) =
244 rtp_packet_get_packet_len (packet) + GST_BUFFER_SIZE (buf);
245 GST_BUFFER_DATA (outbuf) = g_malloc (GST_BUFFER_SIZE (outbuf));
246 GST_BUFFER_TIMESTAMP (outbuf) = rtpgsmenc->next_time;
248 memcpy (GST_BUFFER_DATA (outbuf), packet->data,
249 rtp_packet_get_packet_len (packet));
250 memcpy (GST_BUFFER_DATA (outbuf) + rtp_packet_get_packet_len (packet),
251 GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
253 GST_DEBUG ("gst_rtpgsmenc_chain: pushing buffer of size %d",
254 GST_BUFFER_SIZE (outbuf));
255 gst_pad_push (rtpgsmenc->srcpad, GST_DATA (outbuf));
258 rtpgsmenc->next_time += rtpgsmenc->time_interval * GST_BUFFER_SIZE (buf);
260 rtp_packet_free (packet);
261 gst_buffer_unref (buf);
265 gst_rtpgsmenc_set_property (GObject * object, guint prop_id,
266 const GValue * value, GParamSpec * pspec)
268 GstRtpGSMEnc *rtpgsmenc;
270 /* it's not null if we got it, but it might not be ours */
271 g_return_if_fail (GST_IS_RTP_GSM_ENC (object));
272 rtpgsmenc = GST_RTP_GSM_ENC (object);
281 gst_rtpgsmenc_get_property (GObject * object, guint prop_id, GValue * value,
284 GstRtpGSMEnc *rtpgsmenc;
286 /* it's not null if we got it, but it might not be ours */
287 g_return_if_fail (GST_IS_RTP_GSM_ENC (object));
288 rtpgsmenc = GST_RTP_GSM_ENC (object);
292 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
297 static GstElementStateReturn
298 gst_rtpgsmenc_change_state (GstElement * element)
300 GstRtpGSMEnc *rtpgsmenc;
302 g_return_val_if_fail (GST_IS_RTP_GSM_ENC (element), GST_STATE_FAILURE);
304 rtpgsmenc = GST_RTP_GSM_ENC (element);
306 GST_DEBUG ("state pending %d\n", GST_STATE_PENDING (element));
308 /* if going down into NULL state, close the file if it's open */
309 switch (GST_STATE_TRANSITION (element)) {
310 case GST_STATE_NULL_TO_READY:
313 case GST_STATE_READY_TO_NULL:
320 /* if we haven't failed already, give the parent class a chance to ;-) */
321 if (GST_ELEMENT_CLASS (parent_class)->change_state)
322 return GST_ELEMENT_CLASS (parent_class)->change_state (element);
324 return GST_STATE_SUCCESS;
328 gst_rtpgsmenc_plugin_init (GstPlugin * plugin)
330 return gst_element_register (plugin, "rtpgsmenc",
331 GST_RANK_NONE, GST_TYPE_RTP_GSM_ENC);